15. Romaine Lettuce.
If you are trying to eat healthy to be healthier then there is a chance that you have enjoyed some of this popular lettuce. Romaine lettuce is the main player in a Caesar salad and goes well in many other dishes that contain lettuce. Romaine lettuce falls to only 10 on the glycemic index, which is quite low. A large serving of about 60 grams of lettuce provides a glycemic load of about six, which good for your metabolic health. Consider adding more Romaine lettuce to your diet as part of a low glycemic meal, dish, or side.